Is it really the knowledge that's fading away or
the technique?
I mean, seriously, there is nothing complicated about core planes.
Its a bunch of toroids with wires strung through them.
Tricks of the trade that make the job easier.
One of the better known tricks it to pull apart a wire to be strung
though a line of cores, rather than cutting it normally, so you get a
little bit of a needle like tapered end on the wire.
--
Will